TestBed

interface

Configures and initializes environment for unit testing and provides methods for creating components and services in unit tests.

interface TestBed {
  platform: PlatformRef
  ngModule: Type<any> | Type<any>[]
  initTestEnvironment(ngModule: Type<any> | Type<any>[], platform: PlatformRef, aotSummaries?: () => any[]): void
  resetTestEnvironment(): void
  resetTestingModule(): void
  configureCompiler(config: { providers?: any[]; useJit?: boolean; }): void
  configureTestingModule(moduleDef: TestModuleMetadata): void
  compileComponents(): Promise<any>
  get(token: any, notFoundValue?: any): any
  execute(tokens: any[], fn: Function, context?: any): any
  overrideModule(ngModule: Type<any>, override: MetadataOverride<NgModule>): void
  overrideComponent(component: Type<any>, override: MetadataOverride<Component>): void
  overrideDirective(directive: Type<any>, override: MetadataOverride<Directive>): void
  overridePipe(pipe: Type<any>, override: MetadataOverride<Pipe>): void
  overrideProvider(token: any, provider: { useFactory: Function; deps: any[]; }): void
  deprecatedOverrideProvider(token: any, provider: { useFactory: Function; deps: any[]; }): void
  overrideTemplateUsingTestingModule(component: Type<any>, template: string): void
  createComponent<T>(component: Type<T>): ComponentFixture<T>
}

Description

TestBed is the primary api for writing unit tests for Angular applications and libraries.

Note: Use TestBed in tests. It will be set to either TestBedViewEngine or TestBedRender3 according to the compiler used.

Properties

Property	Description
`platform: PlatformRef`
`ngModule: Type<any> \| Type<any>[]`

Methods

initTestEnvironment()

Initialize the environment for testing with a compiler factory, a PlatformRef, and an angular module. These are common to every test in the suite.

`initTestEnvironment(ngModule: Type<any> | Type<any>[], platform: PlatformRef, aotSummaries?: () => any[]): void`

Parameters

`ngModule`	`Type \| Type[]`
`platform`	`PlatformRef`
`aotSummaries`	`() => any[]`	Optional. Default is `undefined`.

Returns

void

This may only be called once, to set up the common providers for the current test suite on the current platform. If you absolutely need to change the providers, first use resetTestEnvironment.

Test modules and platforms for individual platforms are available from '@angular/<platform_name>/testing'.

resetTestEnvironment()
Reset the providers for the test injector.
`resetTestEnvironment(): void` Parameters There are no parameters. Returns `void`

resetTestingModule()
`resetTestingModule(): void` Parameters There are no parameters. Returns `void`

configureCompiler()

`configureCompiler(config: { providers?: any[]; useJit?: boolean; }): void`

Parameters

config object

Returns

void

configureTestingModule()

`configureTestingModule(moduleDef: TestModuleMetadata): void`

Parameters

moduleDef TestModuleMetadata

Returns

void

compileComponents()
`compileComponents(): Promise<any>` Parameters There are no parameters. Returns `Promise<any>`

get()

`get(token: any, notFoundValue?: any): any`

Parameters

`token`	`any`
`notFoundValue`	`any`	Optional. Default is `undefined`.

Returns

any

execute()

`execute(tokens: any[], fn: Function, context?: any): any`

Parameters

`tokens`	`any[]`
`fn`	`Function`
`context`	`any`	Optional. Default is `undefined`.

Returns

any

overrideModule()

`overrideModule(ngModule: Type<any>, override: MetadataOverride<NgModule>): void`

Parameters

`ngModule`	`Type`
`override`	`MetadataOverride`

Returns

void

overrideComponent()

`overrideComponent(component: Type<any>, override: MetadataOverride<Component>): void`

Parameters

`component`	`Type`
`override`	`MetadataOverride`

Returns

void

overrideDirective()

`overrideDirective(directive: Type<any>, override: MetadataOverride<Directive>): void`

Parameters

`directive`	`Type`
`override`	`MetadataOverride`

Returns

void

overridePipe()

`overridePipe(pipe: Type<any>, override: MetadataOverride<Pipe>): void`

Parameters

`pipe`	`Type`
`override`	`MetadataOverride`

Returns

void

overrideProvider()

Overwrites all providers for the given token with the given provider definition.

`overrideProvider(token: any, provider: { useValue: any; }): void`

Parameters

`token`	`any`
`provider`	`{ useValue: any; }`

Returns

void

`overrideProvider(token: any, provider: { useFactory?: Function; useValue?: any; deps?: any[]; }): void`

Parameters

`token`	`any`
`provider`	`object`

Returns

void

deprecatedOverrideProvider()

Overwrites all providers for the given token with the given provider definition.

`deprecatedOverrideProvider(token: any, provider: { useValue: any; }): void`

Parameters

`token`	`any`
`provider`	`{ useValue: any; }`

Returns

void

`deprecatedOverrideProvider(token: any, provider: { useFactory?: Function; useValue?: any; deps?: any[]; }): void`

Parameters

`token`	`any`
`provider`	`object`

Returns

void

overrideTemplateUsingTestingModule()

`overrideTemplateUsingTestingModule(component: Type<any>, template: string): void`

Parameters

`component`	`Type`
`template`	`string`

Returns

void

createComponent()

`createComponent<T>(component: Type<T>): ComponentFixture<T>`

Parameters

component Type

Returns

ComponentFixture<T>

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Licensed under the Creative Commons Attribution License 4.0.
https://v7.angular.io/api/core/testing/TestBed